<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <input type="text" id="app">
    <script>
        var students = [{
                name: "李四",
                age: "18岁"
            },
            {
                name: "李二",
                age: "11岁"
            },
            {
                name: "李三",
                age: "19岁"
            },
            {
                name: "王五",
                age: "22.5岁"
            },

        ]
        var app = document.getElementById('app');
        app.onkeydown = function (event) {
            if (event.keyCode == 13) {
                var keyword = this.value; {
                    var res = students.filter(item => {
                         return item.name.includes(keyword);
                    })
                }

                console.log(res);
            }

        }
    </script>
</body>

</html>